BULL. GEOL. SOC. AM. 



VOL. 19, 1907, PL. 10 



FiGLTIE 1. STRF.A.M CUTTIXfi RECENT CoXGLO.M EltATE 



Note cutting through of the constituent pebbles In foreground : undercutting of softer 

 Cretaceous sandstone in middle and on right of picture ; slope of the conglomerate-sand- 

 stone contact ou right, indicating deposition of the former in stream trench with steep 

 sloping sides ; and finall.v the conglomerate-floored valle.v bottom, a few feet above the 

 jiresent stream level. View looking west up White creek, 14 miles northwest of Coa- 

 linga, California. Photograph by the TJ. S. Geological Survey (Ralph Arnold). 



FiGDRE 2. — Stream Conglomerate ix Process of For.mi.nc; 



P.ed of White creek, showing white crust of calcium and magnesium carbonates, etcet- 

 era, cementing the lioulders and pebliles info n level pavement. Note narrow channel 

 occupied liy strciun (hiring low water in summer niontlis. \'i('w hioking up si ream, 12 

 mih's uorthwest of Coalinga, California. I'holograph l}y the U. S. (leological Survey 

 (Itobert Anderson). 



STREAM CONGLOMERATE 



